Propeller.



fyi/f2 A.. VON PARSEVAL.

PROPELLBR.

APPLICATION FILED APB. 6. 190B.

Patented Apr.12,191o.

UNITED sTATEs PATENT oEEIoE.

AUGUST VON PARSEVAL, 0F CHABLO'ITENBURG, GERMANY.

:PROPELLER' arranged in such a manner that the most.

favorable division of power is obtained with the greatest eiiiciency in operation.

In the hitherto known propellers with non-rigid blades of which the shape and tension are maintained by the centrifugal force-` of ily weights the provision of large weights at the ends of the blades gives the disadvanta e that an unsteady movement is obtaine owing tothe fact that the weights do not act upon the same 'parts as the air resistance. Further large weights when starting and stopping the propeller are a source of danger to the parts of the air ship and especially to the occupants of the car.

For the purpose of obviating these disadvantages I provide as Hy-weights heavy ropes or chains which are embedded in the front edge of the propeller. Besides this I also form the ytransverse stays for stiliening the blades as fly-weights. By these means the mass of the iy-weights is divided over the whole surface of the blades.

-The invention will be'more clearly understood by reference to the accompanying drawings in which similar references refer to the same parts.

Figure 1 is a side elevation of a non-rigid air propeller according to the invention.

- Fig. 2 'is a front elevation of the propeller illustrated in Fig. 1 and Fig. 3` is a plan.

To hubs3 mounted on the shaft 1, which is mounted in suitable bearings 2, there are fixed one behind the other two sets of radial supports 4 in the form of the letter X which i' are sti'ened and connected together by longitudinal stays 5 land transverse stays 6 and which form the hub of the air fropeller. For further stiffening the hub provide cords 7 which have one end attached to the supports 4 and the other end to sleeves 8 mounted upon-the shaft 1.

Specicatio of Letters Patent. Application led Api-i1 6, 1908. Serial No. 425,427.

i scribed a shaft, a

Patented Apr.' 12, i910..

' To both the outer ends of.one of the members of one of the supports 4 are attached heavy ropes or chains 9 and to these is attached one side of the material 10 forming thepropeller blades. The free inner endl of the other edge of thematerial is attached to the end of the support 4 lying diagonally opposite the point of attachment of the ropes 9 while the fourth corner of the blade is entirely free. For the purpose of preventing the formation of folds in the blades transverse bars 11 are provided which also serve as fly-weights. The screw shape of the propeller blade is formed by the resistl one construction I do notfwish to be limited to this as the details of courseI can be varied without altering the 'feat-ure of the invention namely the hub may be formed in any suitable manner. The essential feature is that the fi, -weights which serve to sti'en the propel er are divided over the whole length of the propeller blades and consist of pliant material such as ropes or chains and that the transverse rods simultaneously serve as fly-Weights.

What I claim as my invention and desire to secure by Letters Patent is 1. In an air propeller of the type de scribed a shaft, a hub fixed upon the shaft, non-rigid propeller blades fixed to the hub, said blades being tensioned by fly-weights divided over their whole surfaces, and means for preventing the formation of folds in the said blades.

' 2. In an `air propeller of the type described a shaft a -hub mounted upon the shaft, non-rigid propeller blades attached to the hub, heavy ropes or chains also attached to the hub and to one of the longitudinal edges of the blades and means for preventing the'formation of folds in the said blades.

3. In an air propeller of the type described a shaft, a hub mounted upon the shaft, non-rig1d propeller blades fixed to the hub, heavy ropes or chains also attached to the hub and to one of the longitudinal edges of the blades and transverse rods attached to the blades for preventing the formation of folds.

4. In lan air prolpeller of the type deub mounted upon the shaft, non-rigid propeller blades fixed to the In witness whereof I have hereunto seil hub, helvy ropes or chains also c onncted my hand this 21stday of March, 1908.

to the ub and to one of the lon 'tu inal edges of theblades, and transversegiods at- AUGUST VON PARSEVAL' 'cached to the blades for preventing the for- Witnesses mation of folds, the transverse rods being of MORITZ WETZEL, such a Weight that they act as fly-Weights. OTTO SCHROED'ER. 

